Be very gradual Honey for the A time. Do it step by step every 10min for 3-4 days and you will get there. Even 9:15 would be a nice target. If morning nap is short go for 2.5h A once again. so the schedule would be more like:
7am WU
9:15/9:30 a nap till 10:00
12:30 next nap - and this one I would encourage you to try to extend as establishing good sleep in the middle of the day can be really valuable
Depending how much he slept offer another short nap (45-15min) in the afternoon and aim for 7pm BT.
Re GW - I prefer it myself. Crying won't be long Honey, don't worry. And your LO can really surprise you:). The case with settling in your arms is obvious, but if he will calm down only in your arms, he will be waking at night and needing the same actions from your side. At 6mo it's probably not such a prop, but within weeks it may be worse and worse as the independent settling skills are becoming more important at that age.